Grinding and polishing machine



Aug. 16, 1932. (5.. A. CARLSON GRINDING AND POLISHING MACHINE Filed June 20, 1950 5 Sheets-Sheet l I INVENTOR 646/006 Cm' ATTORNEYS Aug. 16, 1932. G. A. CARLSON 1,871,494

GRINDING AND POLISHING MACHINE Filed June 20, 1950 s Sheets-Sheet 2 ATTORN EXS Aug. 16, 1932.

G. A. CARLSON GRINDING AND POLISHING MACHINE 5 Sheets-Sheet 5 Filed June 20, 1950 ATTORNEYS Patented Aug. 15, 1932 stares :PA'TE,

'eUs'rAvn A. CARLSON, on DETROITKMICHIGAN' NT OFF-[CE GRINDING ANDIPOLISHQING MACHINE 1' Applicationfiled June 20,

The present invention pertains-to a novel grinding andpolishmg machine of a type particularly adapted for grinding and polishing the shells of head lights used upon 1' ifiautomobile and similar'vehicles. v

The primary objectof thepresent inventio'n is todevise a machine for supporting androtating aheadlight shell in contact with a grinding or polishing wheel, the machine 7 cal axis while it is being moved longitudinal- .ly in a horizontal plane, thereby permitting the use of a comparatively wide grindingand polishing wheel and insuring even wear upon the latter due to the manner in which the T3 shell is moved along the horizontal plane.

Mechanism is provided to insure even grinding ofthe shell andfor swinging the work supporting members a suficient distance away from the wheelthat the work may be i 1 conveniently removed fromits supporting chuck without danger of it contactingwith the wheel during the removing operation.

With the above and other endsin view the invention consists in the matters hereinafter [.1 set forth and more particularly pointed out in the appended claims,reference being had to the accompanying drawings, in which Figure 1 is 'a side elevation of the present machine during the grinding operation;

Fig. 2 is a fragmentary cross sectional view of-the machine, taken on the line 2+2 of Fig.1; V V Fig. 3 is a front elevationof the machine, I partly broken away andjin cross section;

Fig. 4 is across sectional View taken on theline H of Fig. 3, and 7 Fig. 5 is a top plan view. I r

Like characters of reference are employed throughout to designate'the corresponding parts. c 3 q The numeral 1 indicates a grinding wheel which is mounted upon a by any suitable means. i a c a A base member 3 is formed with a head-l in which areformed iways 5 to receive the formed cars 24 base 2 and driven 1920. semi No. 462,465.

table 6, a hand wheel 7 being mounted upon a screw 8 to propel the table 6 longitudinally in the 'ways 5. In the upper surface of the table 6. and at right angles to the ways 5 there'are provided ways 9 whichreceive the cross table 10, a hand wheel .11being mounted upon a screw 12 for moving thetable in the ways 9. i v

The cross table 10 is provided with a central bore to accommodate a bolt 13 which se-j cures a plate 14: upon the upper surface of the table in a manner permitting rotative movement of the plate relative'thereto. A

at 18 to receive a pintle 19 mounted in a pin 20. Thepin 20 projects through a bore 21 in the plate 14 and the'lower projecting end is received in a hole 22 in the uppersurface of the table 10 in'a manner to prevent rotation ofcthe plate relative to the table. A coiled spring exerts pressure upon the [lever 17 whereby it maintains the pin 20 in the hole "22 and by moving the lever 17 in amanner to compress the spring 23 the pin 20 iswithdrawn from .the hole 22 and rotation of the plate relative to the table 10 is permitted.

On the upper surface of the plate 14: are

to which are pivotally. secured theears 25 that are formed on the under surface 7 of guide plate; 26. Compressed coiled springs 27 are interposed between the plate 14 and the guide plate 26' to exert upward pressure on the latter and a set screw.

28 is rigidly secured in the plate 14, by nuts 29 and projects upwardly. through and above the guide plate and has a spring surrounding the upper'portion thereof and adapted'to exert pressure downwardly upon the guide plate 26 when compressed by means of the wing nut 30. A positioning screw 31 has its lower end secured in the plate 14 by nuts 32 and has-itsupper end projecting through the guide plate 26 so that by tightening the nuts 33 against both sides of the guide plate pivotal movement thereof can be prevented and by spacing the nuts as illustrated in the drawings. they-provide positiveflimits for the pivotal movement of the guide plate.

bracket 15 is bolted to the upper surface of the plate 14 as at 16 and pivotally supports a lever 17 which has its inner end forked as when. the sh l 72' as The guide plate 26 supports a carriage 3.4

in a manner to guide it in longitudinal movehead 68.

p ir o the same on their pivots.

ment, the carriage having a boss formed thereof to receive the lower end of a shaft 36 which projects upwardly through the casing 37 into the casing 38 to which it is keyed as at 39; Beneath the casing 37 there is keyed on the shaft 36 a pinion 40 which meshes with the rack 41 that is mounted by a bracket 42 upon the guide plate 26 and it therefore becomes apparent that sliding movement of the carriage causes rotation of the shaft 36 and the casing 38 which is keyed thereto.

Supported by a bracket 43 upon the upper art of the casing 3811s a motor 44 having a the wheel or pulley 46 to 1'0- The worm 47 rotates a worm wheel that 'iS, mounted upon a shaft 49 which "is 'jo'urna'lled atboth ends in thecasing 36.

A worm 50'is mounted upon the shaft 49 to rotate a'worm wheel 51 that is' mounted upon 'the've'rtical shaft 52 which has its lower end supported in a frame 53 formed on the car- The lower end of the shaft 52 supr -g Te-c portsa crankarm 54 which has a slot 55 formed therein to receive a pintle'56 that supports therolle'r 56 that is received between cross members 5'? that are rigidly mounted upon the guide plate 26. It is apparent from this description that rotation of back and forth'on the guide plate 26.

'On the outer extremity .of the shaft 67 is formed a head 68 which'is slotted to pivotally support a plurality of bell-crank'levers 69 that are normally forced outwardly by springs 70. The head 68is provided with shoulders 71 to engage the outside of a 0 flange formed on the head-light shell 72 while 't-hebell crank levers engage the inside of 'the flange to hold theshell on the To operate the bell crank levers in a manner to draw them into contact with f'thesh'ell there is provided brackets 73 on "t e Casing :8 to, pp ta ever. hi h slides the adjusting'member 76" in 'a mannet whe eby the rece 5, me n h thereof engages the bel'lcrank levers to rock v been placed on the jhead 68 'in the above described manner the shell is brought into contact with the wheel by-manipulation of the hand wheels 7 and n The motor 44' then drives-the shaft 49 and the worm 50 rotates thewheel 51 to rotate the crank 54 which causes sliding move- 7 ment backand forth of the carriage 34, causingthe head 68 afnd the shell 72 to be moved across the face of the wheel 1. The sliding movement of the carriage causes the gear'40 to be moved correspor'idi ngly across the rack '41 which causes rotation of the shaft 36 accordijngjto the direction of the sliding movement and the casing 38, being keyed to the'sh'aft 36 rotates therewith from the posi- 54 causes the-carriage 34 to slide tion shown invfull lines in Fig. 5 to that shown in phantom lines.

At the same time the above movement is taking place the motor is rotating the shaft 67 and head 68 through the shaft 49, gear 50, sleeve 60, gear 61, gear 62, shaft 63, pinion 64, idler gear and gear 66 the shell may be conveniently ground. a

It is obvious and well known that when sliding movement is caused by a rotating crank in the manner in which the carriage 34 is 'moyed that when the carriage comes to the end of its sliding movement there is a slight hesitation before it' starts back again. Tonprevent excess grinding'of that portion of the shell which is in contactwith'the wheel when this hesitation occurs the present invention provides'a member 7 6 having cams 77 formed or mounted upon each end thereof, the member 76 being rigidly secured upon the sliding carriage '34 and having the cams positioned so that they engage a roller 78'at precisely the'moment the above described hesitation occurs, is supported by an arm 7 9 which is rigidly secured upon the plate 14 so that the cams 77 cause the carriage, and guide plate 26 to move on its pivot to rock the head 68 and shell 72 out of contact with the grinding present invention has been illustrated and described it is to be understood that various changes may be made in the details of construction without departing from the spirit of the invention as depictedin the following claims, and such changes are contemplated;

lVhat Iclaim is z- I 1. The combination with a grinding Wheel, of a. rotatable head adapted to support-a shell, a casing supporting said head, longitudinally s'lidable means supporting saidcasing, a rack 'and'pin-ion connection between said casing and said shdable means whereby sliding movement of said means causes rotation of a specific embodiment of the.

The roller 78 said casing, and a motor for rotating said.

head and slidingsaid slidable means.

2. The combination with a grinding wheel, of a rotatable work supporting head, a casing supporting said head, a slidable carriage supporting said casing, a rack, a gear carried by said casing and engaging said rack in a manner whereby sliding'movement of saidcarriage causes rotation ofsaid casing, and a motor for rotating said head and sliding said carriage. s i

3r, The-combination with a grinding-wheel,

of a pivoted guide plate, a slidable carriage said roller engages said cams at the end of the mounted upon said guide plate, a casing supreciprocable movement of said carriage to ported by said carriage, means for causing pivot said guide plate and move the work rotation of said casing as a result of the slidsupporting head away from said grinding ing movement of said carriage, a rotatable wheel.

head supported by said casing and adapted In testimony whereof I aflix my signature. to support a shell to be ground, and a motor GUSTAVE A. CARLSON. for reciprocating said carriage and rotating said head.

4:. The combination with a grinding wheel,

of a pivoted guide plate, a slidable carriage mounted upon said guide plate, a casing supported by said carriage, means for causin rotation of said casing as a result of the sli ing movement of said carriage, a rotatable head supported by said casing and adapted to support a shell to be ground, a motor for reciprocating said carriage and rotating said head, and resilient means for exerting pressure upon said pivoted guide plate whereby V the shell on said head contacts with the grinding wheel at all stages of the rotation of said casing.

5. The combination with a grinding wheel, of an adjustable table, a pivoted guide plate v supported upon said table, a reciprocal carriage mounted upon said guide plate, a casing carried by said carriage and having a gear secured thereto and meshing with a rack carried by said guide plate whereby reciprocation of said carriage causes rotation of said casing, a work supporting head supported by said casing, and a motor connected to drive said head and reciprocate said carriage.

6. The combination with a grinding wheel, 1 V V I 109' of an adjustable table, a pivoted guide plate supported upon said table, a reciprocal carriage mounted upon said guide plate, a casing carried by said carriage and having a gear 7 secured thereto and meshing with a rack car- V ried by said guide plate whereby reciprocation of said carriage causes rotation of said casing, a work supporting head supported by said casing, a motor connected to drive said head and reciprocate said carriage, and v resilient means acting upon said pivoted guide plate to hold the work'on said head in contact with said wheel.

7. The combination with a grinding wheel, r of an adjustable table, a pivoted guide plate supported upon said table, a reciprocal carriagemounted upon said guide plate, a casing carried by said carriage and having a gear secured thereto and meshing with a rack carried by said guide plate whereby reciprocation of said carriage causes rotation of said casing, a work supporting head supported by said casing, a motor connected to drive 1 said head and reciprocate said carriage, re- 7 12 silient means acting upon said pivoted guide plate to hold the work on said head in contact with said wheel, cams mounted upon said reciproca-ble carriage, and a roller supported by V I a 7 an arm on said table in a manner whereby f i 9 

